CI: Also fetch build number token on GA

GitHub Actions previously did not use the build number token. This is
changed by this commit. In order to to so, the build process has been
outsourced into its own script.

.github/workflows/build.sh

@@ -0,0 +1,27 @@
+#!/usr/bin/env bash
+
+set -e
+
+buildDir="${GITHUB_WORKSPACE}/build"
+
+mkdir "$buildDir"
+
+cd "$buildDir"
+
+VERSION=$("${GITHUB_WORKSPACE}/scripts/mumble-version.py")
+BUILD_NUMBER=$("${GITHUB_WORKSPACE}/scripts/mumble-build-number.py" --commit "${GITHUB_SHA}" --version "${VERSION}" \
+	--password "${MUMBLE_BUILD_NUMBER_TOKEN}" --default 0)
+
+# Run cmake with all necessary options
+cmake -G Ninja \
+	  -S "$GITHUB_WORKSPACE" \
+	  -DCMAKE_BUILD_TYPE=$BUILD_TYPE \
+	  -DBUILD_NUMBER=$BUILD_NUMBER \
+	  $CMAKE_OPTIONS \
+      -DCMAKE_UNITY_BUILD=ON \
+	  $ADDITIONAL_CMAKE_OPTIONS \
+	  $VCPKG_CMAKE_OPTIONS
+
+# Actually build
+cmake --build . --config $BUILD_TYPE
+

.github/workflows/build.yml

@@ -50,22 +50,14 @@ jobs:
           arch: ${{ matrix.arch }}
 
 
-    - name: Create build dir
-      run: cmake -E make_directory ${{runner.workspace}}/build
-
-    - name: Run CMake
-      run: |
-          cmake -G Ninja -S $GITHUB_WORKSPACE -B ${{runner.workspace}}/build -DCMAKE_BUILD_TYPE=$BUILD_TYPE $CMAKE_OPTIONS \
-          -DCMAKE_UNITY_BUILD=ON $ADDITIONAL_CMAKE_OPTIONS $VCPKG_CMAKE_OPTIONS
-      shell: bash
-
     - name: Build
-      working-directory: ${{runner.workspace}}/build
-      run: cmake --build . --config $BUILD_TYPE
+      run: ./.github/workflows/build.sh
       shell: bash
+      env:
+          MUMBLE_BUILD_NUMBER_TOKEN: ${{ secrets.BUILD_NUMBER_TOKEN }}
 
     - name: Test
-      working-directory: ${{runner.workspace}}/build
+      working-directory: ${{ github.workspace }}/build
       shell: bash
-      run: QT_QPA_PLATFORM=offscreen ctest -output-on-failure -C $BUILD_TYPE
+      run: QT_QPA_PLATFORM=offscreen ctest --output-on-failure -C $BUILD_TYPE